66 Keysight NFA Series Noise Figure Analyzers Service Guide
Boot Up and Initialization Troubleshooting
Signal Level Verification
Signal Level Verification
Signal Level Problem with
Input Frequencies < 3.6 GHz
Measure the 50 MHz RF calibrator signal level by pressing MODE/MEAS,
Spectrum Analyzer, OK, Input/Output, RF Calibrator, 50 MHz. Now press
FREQ, and input 50 MHz, Span, 1 MHz, Peak Search. If the analyzer is
functioning correctly in low band, the 50 MHz calibrator level should be
−25 dBm ± 2 dB. See the figure below.
Is the signal level correct?
If yes:
The analyzer low band path is functioning properly at least at 50 MHz.
If no:
Refer to Chapter 4, “RF Section Troubleshooting (N8973B, 74B, 75B
Analyzers)” in this manual.
It is possible that other input frequencies < 3.6 GHz could have an
amplitude problem even though the 50 MHz calibrator is within tolerance.
Using the internal RF calibrator provides a quick check of the low band
path.
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